[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   15.226532] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   20.070866] random: sshd: uninitialized urandom read (32 bytes read)
[   20.312273] random: sshd: uninitialized urandom read (32 bytes read)
[   20.801325] random: sshd: uninitialized urandom read (32 bytes read)
[   39.070834] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts.
[   44.749117] random: sshd: uninitialized urandom read (32 bytes read)
2018/08/22 04:51:58 parsed 1 programs
[   46.167153] random: cc1: uninitialized urandom read (8 bytes read)
2018/08/22 04:52:01 executed programs: 0
[   47.397670] IPVS: Creating netns size=2536 id=1
[   47.524985] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
[   47.536617] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
[   47.582161] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready
[   47.593807] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready
[   47.638589] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
[   47.650514] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
[   47.662922] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
[   47.676247] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
[   48.206331] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
[   48.234367] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
[   48.240676] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
[   48.247414] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   48.461453] hrtimer: interrupt took 12044 ns
[   48.557046] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   48.628045] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9
[   48.666122] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[   48.674507] IP: [<ffffffff836c7e40>] l2tp_session_create+0xc60/0x16f0
[   48.681212] PGD 1d46f6067 [   48.683863] PUD 1d86f8067 
PMD 0 [   48.687338] 
[   48.688958] Oops: 0002 [#1] PREEMPT SMP KASAN
[   48.693588] Dumping ftrace buffer:
[   48.697115]    (ftrace buffer empty)
[   48.700802] Modules linked in:
[   48.704107] CPU: 1 PID: 4290 Comm: syz-executor0 Not tainted 4.9.122-g54068d6 #78
[   48.711700] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   48.721032] task: ffff8801d5238000 task.stack: ffff8801d7278000
[   48.727064] RIP: 0010:[<ffffffff836c7e40>]  [<ffffffff836c7e40>] l2tp_session_create+0xc60/0x16f0
[   48.736181] RSP: 0018:ffff8801d727fac0  EFLAGS: 00010246
[   48.741645] RAX: 0000000000000000 RBX: ffff8801d45f7900 RCX: 1ffff1003aa4711d
[   48.748897] RDX: 1ffff1003a8908d0 RSI: ffff8801d52388c8 RDI: ffff8801d4484680
[   48.756141] RBP: ffff8801d727fb60 R08: ffff8801d52388e8 R09: 0000000000000000
[   48.763388] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d4484558
[   48.770635] R13: 0000000000000000 R14: ffff8801d4484500 R15: ffff8801d727fc78
[   48.777881] FS:  00007efcd49da700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
[   48.786085] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   48.791952] CR2: 0000000000000080 CR3: 00000001d79d3000 CR4: 00000000001606f0
[   48.799205] Stack:
[   48.801334]  0000000000000201 ffffffff836c9151 ffff8801d727fae0 ffffffff81237ecd
[   48.809428]  ffff8801d4484500 ffff8801d45f7a58 ffff8801d4484558 ffff8801d45f7a50
[   48.817436]  ffff8801d45f79b0 ffff8801d4484520 0000000000000000 0000000000000000
[   48.825439] Call Trace:
[   48.828019]  [<ffffffff836c9151>] ? l2tp_session_get+0x1d1/0x790
[   48.834141]  [<ffffffff81237ecd>] ? trace_hardirqs_on+0xd/0x10
[   48.840226]  [<ffffffff836ccff7>] pppol2tp_connect+0x10d7/0x18f0
[   48.846614]  [<ffffffff836cbf20>] ? pppol2tp_seq_show+0xc30/0xc30
[   48.852826]  [<ffffffff8100301a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
[   48.859484]  [<ffffffff81f202ab>] ? check_preemption_disabled+0x3b/0x170
[   48.866305]  [<ffffffff83a01669>] ? retint_kernel+0x2d/0x2d
[   48.871998]  [<ffffffff81cf826f>] ? security_socket_connect+0x8f/0xc0
[   48.878570]  [<ffffffff8301d958>] SYSC_connect+0x1b8/0x300
[   48.884170]  [<ffffffff8301d7a0>] ? SYSC_bind+0x280/0x280
[   48.889692]  [<ffffffff812db6d0>] ? do_futex+0x17c0/0x17c0
[   48.895386]  [<ffffffff8301f830>] ? move_addr_to_kernel+0x50/0x50
[   48.901597]  [<ffffffff83020224>] SyS_connect+0x24/0x30
[   48.906978]  [<ffffffff83020200>] ? SyS_accept+0x30/0x30
[   48.912414]  [<ffffffff81006316>] do_syscall_64+0x1a6/0x490
[   48.918098]  [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
[   48.924997] Code: 00 00 49 8d be 80 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 7b 09 00 00 49 8b 86 80 01 00 00 <f0> ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 
[   48.952003] RIP  [<ffffffff836c7e40>] l2tp_session_create+0xc60/0x16f0
[   48.959091]  RSP <ffff8801d727fac0>
[   48.962690] CR2: 0000000000000080
[   48.967497] ---[ end trace 76db64a087baa349 ]---
[   48.972793] Kernel panic - not syncing: Fatal exception
[   48.978430] Dumping ftrace buffer:
[   48.981956]    (ftrace buffer empty)
[   48.985642] Kernel Offset: disabled
[   48.989248] Rebooting in 86400 seconds..